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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f75a3d6a76c08fdabf8c3780358aa5cf0a44b853eea1d4b894eb1c12d5644f9' 
  AND token = 'DPIPKTnQJ28lyWvzsG37iCeILL1/Nu+J2kn6v70+BSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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