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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd249126ddfeae5c6f4ab1cb4377d31b4c8669425c9ef52ccdba8ad858963f5d3' 
  AND token = '6v5ExdbqZPgtED2L3Vojsqsw16VdWUkT5Z1gdR+4uso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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