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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07d7659e0fd0f5ca4e0ef8504c4468ce7fbc8af0affd1ef31fb2995f4c9e8d8' 
  AND token = '2LsRiy4hCu4OQqcoNRxJTNqnyGQXc7HwHbZzKDdhjek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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