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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2258428dea33baed30558ad5234b1adbd29fe9302bcbc5818cb2c64417ed33' 
  AND token = '9GnPMEjU+KCB9JcBM28LfJrZWW64WUX1BNEtIaZi7RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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