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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d84f20bed8fbebb05eafd8184289d1df1ca77842da85765de328b5e6964a11' 
  AND token = 'MfzF1T2/SnoGVlKX2N1xlhIGhdgbWN7KFAs0fbozIUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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