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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c577a394ebf87a504bbac02824800db5821589a906cd8a0f3a5246d010c89a0e' 
  AND token = '7+sH1SF7WC4BSxID775SWLiifuiOlzWW39pLu7Ih0/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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