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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd44107b347a9a20b36b0da5d8e10f836471cd7ccbad6bcfddcf5526fa2669a' 
  AND token = 'FHuV7LyU205xUzYAJ6PHteOtCcFi1L747MORhkPYmks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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