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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d3774826a1e99853ae4699c385c46aedc642f66251c7f9fe4ee65f9aedc3f5' 
  AND token = 'pSWgu52iBlsEQ9FVzvQWi3Z0/+0qBjSTMo5ExQysHhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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