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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51443e4a7bc875ddcd06f0aada0a355d0f77183053e47b0001cf32c7104144e' 
  AND token = 'gYe8kAgAXxaAUxR3flQ3w0YV6U5bSu3+Xp/uQlJ9jFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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