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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa32ffb333c4d971009091e15611dccc3bee6743d7f1ceb255d4c942d1168f86' 
  AND token = 'gf4WESfIgBomJtFk1yx8DrmKw3XFnMsjmu5kIhYOiFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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