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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5341431f0d2f368085a0c950d196fb40c53a196e3ad0024243148fc8b27b640e' 
  AND token = '98RuI+bBjomimq+0FSvj2qa95urY6ubAh8aplX5qVCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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