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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38f4b725e0a44ff21560cb3fc1823ea8bda1295d0afae1a33c3091ff697f2d5' 
  AND token = 'a6+gFLXL7N8L+VlOPEORF5Lai0TkSRk4LedM/EcM3kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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