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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1991aa5a3f30e3629cf6a8774f95e90bc11a15593fa3972eb3435dfd4bf5f650' 
  AND token = 'jooM5ffcZC4UUAtvejTBpqpx7/1y0rB4ouz4ZlL8zUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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