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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc124424f01081c17ff0ab4b7e0afa12fbd0b86207d0f98e29102a993614207' 
  AND token = 'C9gFwICp5qKslIxaQ+PJXoI4MPMzpdJnJrK9BITIQTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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