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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6feaff08ca69f0eb0c5c0db2c6ad07fb57b94215f98ac24c7e011770b27ed5' 
  AND token = '/eCqaX8iuPCNW8Z0HUilq+0Hb+EbPv/Yki3PPeKi484=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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