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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc031569f0d7b29af306b86230e32d5094dbaea7019d526b267e9480b5c793a7' 
  AND token = 'uyafZia68pvMZ0EIdqu1J8fgnKjm3MH5pAlW2o8yf5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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