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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b27b92cfef6d0a975708806da1af1b96b6fdabff3474e428e5efd0a9a2ff42' 
  AND token = 'gfZ7GP/bEGvehyKcDveChH73QUlAOERW1wA3/KtQKcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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