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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcbc6713c10d8fd5ede412ec13ea5be4ebc9165f3613165cd581e09f55874eb' 
  AND token = 'XyvBLtEsf/tJkPRR9s3NhaD5ilzsnhN+U56rD9+x4l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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