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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4362a5ed602de5d1220bc72d2cd27935d80aaab0fbeb85bd2492be711a0204d2' 
  AND token = 'nkj9NEqWmWKwUGDzkb+iFH+iPH7P1K+W+hXrQYFIpak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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