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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fb43fce4fb97894aba9d6e6de191bce38f5d5605b0d1569ecf376057ce1e23' 
  AND token = 'lizsv3S1dig3vTynZl7+4Bl/ccpB+uZPb9SRR0uQJuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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