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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce38b996e27240bb0db93d8c7eb2b758c2bc8cdbae094af254dd98a022934c36' 
  AND token = 'Qam73eDXPEGTYhLzfDqCHN57T8CzsZl3R3NcODvXQEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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