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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a38bc96e71f84950a9bc270f38b1a2067d71dc2451ad59b9e16ab3f9062cf8' 
  AND token = '5m387ujEdSB6gpTdzeWCoiMFD8MAvp4NMLs1GzNdrjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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