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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28db7d3da0635111317ae646129bfebe12349d09b603de5b30317581cd52d89' 
  AND token = 'dQDwPMdAUP/JX64qZC8xaj9bJToDtIOcXG4aSJisD1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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