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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5f5dbfbf1e22cc2746997f029f283387556c22d1a97eb8bc03ee2d94436b19' 
  AND token = 'CjzfYG/D8+5FiDa6DD86pbxfQTrsh66xvmMEeFjIr/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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