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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65881f2f5566cfd114dc528a1f30a5eae4c30dc60ddff7dea2c9bbcfd1ebd16d' 
  AND token = 'oREPWFc3XY5FnNvZXeRKzuikZb3MxxGy9u/9b7x+55c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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