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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee9392ed18ddde07cd4589ce803a25521e23ac1345f463336baa78fd87bd585' 
  AND token = '2bvqZch2b4qTxEKOGFecvkTwzEeD09LjYgbrRwnwqvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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