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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedc5e279c74207f195bc5621cb339d81fb7f909c8969f83853466447bf98d9d' 
  AND token = 'ZxCIOCUz7b+hKGt4I2y3WN7SLNkfXHoDioMwVS/LMF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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