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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f899090690ba25a0c970055c65f0fb4fa2b89098951fed17b4046a916eaa2a5' 
  AND token = 'wiT87xLSl7wErbaj3QzdL7QMVmTG8OdZDeUCWO2pUFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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