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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a363809fcad9b0e62942ad8d3406678ef82e5b3d988b062a3198ac056291e31' 
  AND token = 'd3NEQTDbrd7gbGT3SIcsbVCIkr7JIj3l1ErP29kKASo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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