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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f260c909d030420df00248cdb397261c4ec2f6b0e61ab9d305ffc6cb9f855f27' 
  AND token = 'V9+UB32SbMonZ2hYFfceVNEzG7CnUnuk6sDrjlW9fpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}