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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a986249b794f94eaa1cf9c07e4195f72ad796dbccb3e57af893ca9e0729bf95f' 
  AND token = '1SDTMfs7jDN8H+ktg8HVs4mmuj8CN/yQB45KjdIKHu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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