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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f5928e454b2dd14788558dc495aa078d62fb433c1c8cc3697603842ad7fd15' 
  AND token = 'JyQV1GCbVIRtbBY0REFYUc1wvbcK07p7+n27yeI1CBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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