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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1742bdf22c587a1f744ff828bc889e0d6a93a86d4776b9d2e9779d96580929d3' 
  AND token = 'BPon1IchCwzqr4TQODcApKCgbE0Yb7bJUTg1geERV8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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