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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95f872cf0afae64402d7cf51eceef53fd47aa11a8136cb876ecefb0f4d477a4' 
  AND token = 'PNHk/FMY7bWdEyVWczkoaXxsX7ApDcHmvSVMtkEe2IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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