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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1594dc28453a1055f31dd8eb8fe040357d2ad7f148c92c6f1f15b1112ddc2707' 
  AND token = 'fAwyurMFFLif2Zm90/+tus73kpDvXpUCEsppKzDskeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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