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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3204fb846f54f715bedabca7aae07328caad899cdb93112432dc1e93280ab73f' 
  AND token = 'v/67w3ctjIdX3VmO/y3/Q1JYS61h9VuiWs0sRU7MC2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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