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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0d35e239bc92ae83b7bfe714b3ab27b9389672f262978e06b970df336155c8' 
  AND token = 'ZN3sGX68p3nzykxROKIVR/nZnZ7xX37bxeJEFT4YE9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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