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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004ecc5a7f9926b10a787c986b02d6492263fecd46a802c90f5df6c59a17ea4c' 
  AND token = 'HMVbFkm14r5OfWVFD6B/x9HUtKJ0kRFTL9E0IHWM05Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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