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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b41dd186170b4ec2b26f196c65631f762093f494b1915ac74850c745c40a58' 
  AND token = 'Fv184/lcQcFbZOui4NrkeWu/hCXY6r8IrxH3yRPflMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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