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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c14f61d6ec49aa22053dbdf0c31beeb5f5e28dea8c1a2c14539af9c997530bd' 
  AND token = 'dM7/hqdCCn6A2wh7O9dPn02axU9rWWYEGliiuemyhb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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