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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ae1355f0194df82c3c4cff9c700f6b0c2957a8d8ba58b8727f8e32a41b4318' 
  AND token = 'bsLPVwvoeacT9TnoqUGzs861Cu72D2zfO8MN+NLLyek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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