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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3996e0caf4bb0e32522cbf75af7189464191fa0e51c9c3f11d15ac871b3fd42a' 
  AND token = 'fzJi1Om/kC2g2/g/DiNaMVOByO5hc5BjWqOHdxlCGjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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