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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526ac5f736def235e6dd2ca9e70e7a65c1f62560547ef040cae74c55f88bb5eb' 
  AND token = '0cIlaP+9OL87aiyu2vFWEU4vAFuy7TooeClMC4nYao0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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