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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba3d42d6d5d07cc9596ec756a7d4c1ebc43374836e5ebdd077cf4ca179051ce' 
  AND token = '9q/GyrPGG3TzoMagua02zezmFQqRF/kLs0grAPcsekA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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