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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f266b327f437cb60a1e53dcea161d5daa5d93c1cc14a6af2ca0467ef0b79a22' 
  AND token = '792pL6bSPm1aoBCt9L2w+U9wX9tJK27LeZTnMwiVrN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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