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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbce1e882ae2ae9056000d22324f7aaf5d26a8ad955aed920173de5502506cf7' 
  AND token = 'g2P//iKAcV46dWOojCpd2pzS+XP8j3RFMnI9ejYbEyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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