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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902dd3e110b44aa71547058d2e9d79eb45459965656cb095f52c7791a740ca68' 
  AND token = 'YElSEKaLQxckTtQsCSoJA5zXXAoRuXu5qjGUY6LDzSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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