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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a093036bc8ba2a0ca84a4c25939c3c957c631e877e51f517091b2a799153210' 
  AND token = 'yNP3wCSzpYTJjmmRqODDW0jI6+w2Undgv3YWI1yW0bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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