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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe01e9da0558092c0b640cb80fdc66155759c81a4cdd29fbe4590b7b8ccf9ec' 
  AND token = '3yUjB+rNS9beGNgWqwHklMC9rkyn+hHCfGoaszgkkpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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