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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290937b1511ef52cdcc4afe1e53b6375cd757a89ad5759e6dfa190d4dee54ae4' 
  AND token = 'HxAORWlTE5eGPW6G5v4+oFG2o5MgxKF8C29OL3t7+lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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