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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a085e3321065936c862fe88d58914b66d1806038bce923e622789b55b0f1b83' 
  AND token = 'Z61uhKfkbUYTlxIcZaW7s9BSFNReakZxMk8yVHlKp/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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