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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b1617e1536c96fddbf7e6aef67ce7f5b06ebb87cbf789826ba794d15e3143a' 
  AND token = 'oPgWfDZfyw0uHTdyQ2KqGpK8llzSLw7d903finLJQOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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