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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4957145842c8619643487aff72400812f24760594f33a877c5bfa9ee15d25e17' 
  AND token = 'RZMPvPDvCmpp6y6TzuD6YkKm5cMTw710/ylgT2V9ryM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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