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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d82a93ed526b706c44992b7d6d4907c9d65096146043dca883f494e071c890' 
  AND token = 'hY9fvLH20QCrtbJd2o70Ty1h+U+WjYsm5POaT8Lm1FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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