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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624eeec2d17d41f9502edddb4b5fcbf5ac8103c388c8b61af47ef6d82173b445' 
  AND token = 'BHGn0JJjoTaAjASlcQH0sFL+CP0NRizQm8GMKb8+Gp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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