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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea00f0dbfe69be745e8653be3eaaf94bb17fba0a0f1a2e600a5570aa8e84f2b' 
  AND token = '6P3D/Mv20BSKQTcCAZnAOSMeh75S8tc3E1vgzjGWxz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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