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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850f05024b4cca923cd5fb342c80a42dca93af90f90f70cb6f822b1562a24ab9' 
  AND token = 'RbEgvfEuSNaMpgbuN6e4sxJ8bwEu2REHU0AraxQzUD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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