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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb5db6391101dbcbca36500c02bf62fdf16b8206da0a3350195d0ddd2ef317d' 
  AND token = 'DFEP3JLaY6CiLb5+tSul+Ux38OQE0UlmbhY7eGeioeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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